What does "Listed" refer to in terms of appliances and equipment?

"Listed" refers to items that are included on a list published by a recognized organization, which means that these items have been tested and meet specific safety and performance standards. Organizations such as Underwriters Laboratories (UL), the Canadian Standards Association (CSA), and others provide this certification for appliances, equipment, and materials. Being "listed" assures users and inspectors that the item has undergone rigorous evaluation to ensure that it can be used safely in accordance with applicable codes and regulations.

This concept is essential in ensuring safety and compliance within electrical, mechanical, and plumbing installations. A recognized listing indicates that the product has met the necessary standards for quality and safety as determined by expert testing and review, providing peace of mind to consumers and professionals alike.